fix(display): avoid extra row on exact-width softwrap lines - #4217
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A line whose rendered width exactly filled the window would push the next line down by an extra, blank wrapped row. Wrapping is now suppressed for such lines, except when a cursor is parked at the line's end: without the wrapped row there is nowhere to draw that cursor, so it is kept for that frame to stay visible.
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A line whose rendered width exactly filled the window would push the next line down by an extra, blank wrapped row.
Wrapping is now suppressed for such lines, except when a cursor is parked at the line's end: without the wrapped row there is nowhere to draw that cursor, so it is kept for that frame to stay visible.
Example
Given the following text:
Before fix
An extra blank row appears between the first and second lines.
After fix
The second line now appears immediately below the first line, with no extra blank row.
